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10-09-2016, 05:49 AM   #1
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Sigma 17-70 2.8-4.5 aperture problem

I bought myself a Pentax K-S2 and a Sigma 17-70 2.8-4.5 macro lens.
I can't get the aperture wider than 4.0. So I can't get to 2.8-3.9.
And the max aperture is 4.0 on every focal length, eventhough it should be 4.5 on 70mm.
I use following modes: Av and M
Does anyone know what the reason might be for this?

10-09-2016, 06:18 AM   #2
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I have the same camera and lens. Mine shows f2.8 at 17mm and 4.5 at 70, just like it should. I usually use Av mode.
10-09-2016, 01:58 PM   #3
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This might sound silly, but verify that the lens you ordered was the one you received?

Adam
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10-09-2016, 02:09 PM   #4
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QuoteOriginally posted by Adam Quote
This might sound silly, but verify that the lens you ordered was the one you received?
I checked it and it is the same.

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